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Positioner provides early signaling of
impending failure of a valve or actuator Siemens Automation and Drives (A&D) has added new diagnostic functions to its Sipart PS2 electropneumatic positioner. The positioner signals imminent malfunctions in the valve or actuator using “traffic light signaling” in accordance with the Namur NA64 and proposed NE107 requirements. This diagnostics signaling permits the development of ingenious maintenance strategies which improve plant safety and availability. By detecting the early stages of a serious fault, maintenance schedules can be optimized to support both production and safety requirements. 
The Sipart PS2 positioner communicates the fault condition using a green
wrench for "Maintenance required", a yellow wrench for "Urgent
maintenance request", and a red wrench for "Failure of the
valve or actuator, or failure about to occur". This three-step
message hierarchy provides details on the valve or actuator to include:
blocking of a pipe, progressive increases in friction, wear of a valve
plug or seat, incipient diaphragm tears in the actuator and other
potentially dangerous conditions.An outstanding innovation of the Sipart PS2 Auto-Tune software is that it automatically learns the reference performance characteristics of a new valve and actuator system. This innovative process provides a performance benchmark stored in the positioner memory and eliminates the requirement to define actuator models and other installation details through complex calculations, table evaluations and measurement procedures. Usability is further enhanced by optionally displaying the diagnostic signals on the local display, via alarm outputs built into the positioner, or via a communications interface: Hart, Profibus or Foundation Fieldbus to a control system such as Siemens Simatic PCS 7. With easy, flexible access to the diagnostic conditions, performance values, and configuration data the user can choose the interface that works best for their maintenance strategy – from control room PC to onsite local display and pushbuttons. Siemens A&D - Gleiwitzer Str. 555 - 90475 Nürnberg www.siemens.com |
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